[TA] the anterior expanded portion of the middle meatus of the nose, just above the vestibule. Synonym(s): atrium meatus medii [TA], atrium meatus medii nasalis, atrium (4) , nasal atrium
a·tri·um of mid·dle na·sal me·a·tus
(ātrē-ŭm midĕl nāzăl mē-ātŭs) [TA] The anterior expanded portion of the middle meatus of the nose, just above the vestibule. Synonym(s): atrium meatus medii, nasal atrium.